static PixbufImageSurface() { destroy_func = new cairo_destroy_func_t(DestroyPixelData); }
static DataImageSurface() { destroy_func = new cairo_destroy_func_t (DestroyPixelData); }
private static extern Cairo.Status cairo_surface_set_user_data(IntPtr surface, ref int key, IntPtr userdata, cairo_destroy_func_t destroy);
static extern Cairo.Status cairo_surface_set_user_data(IntPtr surface, ref int key, IntPtr userdata, cairo_destroy_func_t destroy);